Fan



June 8, 1937. D N I 2,083,184

FAN

' File'd March 2a, 1936 2 Sheets-Sheet 1 INVENTOR EDW/MD L. A M 752.50.

. MW; PM

ATTORN EYS June 8, 1937. E. ANDERSON 2,033,184

FAN

Filed March 25, 1936 2 Sheets-Sheet 2 INVENTOR fDWA/ED 1.. mvpszsa/v.

ATTORNEYS Patented June 8, 1937 UNITED STATES FAN Edward L. Anderson,

American Blower Corporation,

Detroit, Mich., assignor to Detroit, Mich.,

a corporation of Delaware Application March 23, 1936, Serial No. 70,196

13 Claims.

This invention relates to fans and in particular to means of imparting a whirl to the air entering the fan and of controlling the volume of air that enters the fan whereby the volume may be varied without varying the speed of the fan rotor.

It is a further object of this invention to provide means of adjusting the position at which the whirling air is delivered, into the fan and of adjusting the volume of air delivered to the fan.

It is an additional object to provide means of controlling the re-entry of the air into the fan rotor in order to increase the operative area of the blades of the fan.

Referring to the drawings, Figure 1 is a vertical section through a blower casing, the fan rotor, the Venturi entry throat, and volume and direction control means.

Figure 2 is an end elevation of the volume entry and control means.

Figure 3 is a view similar to Figure 1 showing a modified form of volume and direction controlling means.

Figure 4 is a view similar at the entry end of Figure 3.

Referring to the drawings in detail, I designates a blower casing through which projects a rotor shaft 2 supported in suitable bearings 3 and 4 of any desired character. this shaft is the rotor 5 having a solid back plate 6. I designates the arcuate blades mounted on the back plate 6. A shroud ring 8 is mounted on the opposite ends of the blades in overlapping spaced relationship with respect to the Venturi throat 9 of the entrance passageway casing III that is mounted at H in the inlet opening of the blower. The inlet passageway I0 is conical, terminating in the Venturi throat 9. The space l2 between the Venturi throat 9 and shroud ring 8 permits'the re-entry of air over the ad jacent ends of the fan blades so as to increase the operative area of those fan blades.

Slidably mounted on the shaft 2 on a hub I3 is a plurality of air control vanes l4 that are bent in the direction of the rotation of the rotor 5. The arcuate outer ends'of these vanes are to Figure 2 looking Mounted on designated l5. Due to the fact that these blades purely diagrammatic and a variety of different means and methods maybe employed of actuating and positioning these vanes 14.

Due to the curvature of the vanes, the air entering the blower is given a whirling movement in the direction of the movement imparted to it by the blades 1.

Referring to Figures 1 and 2 particularly, the outer ends of the vanes M are horizontally disposed, while in Figures Band 4 the outer ends of the vanes are inclined parallel to the conical taper of the inlet passageway Ill. The advantages, under certain conditions, of the inclination of the outer ends of the vanes l4 (Figures 3 and 4) are three-fold. This inclination permits of the use of stay rods substantially parallel to. the inclined ends of the vanes to secure together the shrould ring 8 and the hub 5 of the fan rotor where ultimate rigidity of the fan rotor construction is desired. The inclination likewise provides for a quicker release of {the vanes than is otherwise possible, where space, in an axial direction, is at a premium because, for movement of the vanes a given distance axially of the shaft 2 toward the dotted line position, the vanes with inclined ends (Figures 3 and 4) will lose efiectiveness to a greaterdegree than will vanes such as those shown in Figures 1 and 2. Furthermore, the inclination of the outer ends of the vanes 14 brings the vanes further away from the roots of the blades 1 in the fan rotor, which increases quietness of operation of the blower.

' It will be understood that I desire to comprehend within my invention such modifications as may be necessary to adapt it to varying conditions and uses.

' Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a blower, the combination of a casing, a rotor, and means slidably mounted to extend within the rotor of the blower for imparting a preliminary whirling motion to the air delivered to the rotor and for controlling the volume of air delivered thereby.

2. In a blower, the combination of a casing, a rotor, and means including arcuate vanes slidably mounted to extend within the rotor of the blower for controlling the volume of air delivered thereby and for imparting to the air delivered to the rotor of the blower a preliminary whirling movement.

3. In a blower, the combination of a casing, a rotor, and means including arcuate vanes slidably mounted to extend within the rotor of the blower for controlling the volume of air delivered thereby and for imparting to the air delivered to the rotor of the blower a preliminary whirling movement in the direction of the movement of the 5 rotor.

4. In combination, in a blower, of a casing, an inlet passageway extending into the casing, a fan rotor adjacent thereto, and means reciprocable through the inlet passageway and into the interior of the rotor of the blower for imparting a preliminary whirling motion to the air delivered to the rotorand for controlling the volume of air delivered by the rotor from the blower.

5. In combination, in a blower, of a casing, an

inlet passageway extending into the casing, a

fan rotor adjacent thereto, and means reciprocable through the inlet passageway and into the interior of therotor of the blower for controlling the volume of air delivered by the rotor from the blower, said means being so arranged as to direct the air so delivered with a preliminary whirling movement.

6. In a blower, the combination of a casing, a rotor, a conical inlet passageway, and slidable means movable through said passageway and into the rotor for imparting a preliminary whirl ing motion to the air delivered to the rotor and for controlling the volume of air delivered by the rotor of the blower.

7. In a blower, the combination of a casing, a rotor, a conical inlet passageway, and slidable means movablethrough said passageway and into the rotor for imparting a preliminary whirling motion to the air delivered to the rotor and for control mg, the volume of air delivered by the rotor of the blower, said slidable means comprising a plurality of radially disposed vanes.

- 8. In a blower, the combination of a casing, a rotor, a conical inlet passageway, and slidable means movable through said passageway and into .the rotor for imparting a preliminary whirling motion to the air delivered to the rotor and for controlling the volume of air delivered by the rotor of the blower, said slidable means comprising a plurality of radially disposed arcuate vanes.

9. In a blower, a casing, a rotor, a conical inlet having a Venturi throat, and means for imparting a preliminary whirling motion to the air before it reaches the rotor and for controlling the volume of air delivered by the rotor of the blower comprising a plurality of air control vanes slidably positioned within the air inlet Venturi throat and rotor.

10. In a blower, a casing, a rotor, a conical inlet having a Venturi throat, and means for controlling the volume of air delivered by the rotor of the blower comprising a plurality of air control vanes slidably positioned within the air inlet Venturi throat and rotor, said vanes being curved in direction of the movement of the air by the rotor for imparting a preliminary whirl to the all.

11. In combinatiomin a blower, of a blower casing, arotor having a plurality of arcuate blades arranged parallel to the axis of rotation of the rotor, a conical inlet passageway extending to a point adjacent the rotor, a plurality of arcuate vanes arranged parallel to the flow of air through the inlet passageway with their ends parallel to the rotor blades, and means to adjust the position of said group of arcuate vanes for controlling the volume of air delivered by the rotor of the blower and to control the direction of air entering the blower.

12. In a blower, a casing, a conical inlet passageway, a rotor, a plurality of vanes inclined in the direction of flow of air through the inlet passageway and having their outer ends parallel to the wall of said passageway, and means for adjusting the position of said vanes from a point with their ends remote from the wall of the inlet passageway to a point adjacent thereto whereby the volume of air delivered through the passageway is restricted and controlled and the volume of air delivered by the rotor of the blower is controlled.

13. In a blower, a casing, a conical inlet passageway, a rotor, a plurality of vanes inclined in the direction of fiow of air through the inlet passageway and having their outer ends parallel to the wall of said passageway, means for adjusting the position of said vanes from a point with their ends remote from the wall of the inlet passageway to a point adjacent thereto whereby the volume of airdelivered through the passageway is restricted and controlled and the volume of air delivered by the rotor 01' the blower is controlled, and a Venturi throat on said inlet passageway adapted to diverge from said plurality of vanes. 

